Passage 1 It's one of our common beliefs that mice are afraid of cats. Scientists have long known that even if a mouse has never seen a cat before, it is still able to detect chemical signals released from it and run away in fear. This has always been thought to be something that is
into a mouse's brain. But now Wendy Ingram, a graduate student at the University of California, Berkeley, has challenged this common sense. She has found a way to "cure" mice of their inborn fear of cats by infecting them with a parasite, reported the science journal Nature. The parasite, called Toxoplasma gondii, might sound unfamiliar to you, but the shocking fact is that up to one-third of people around the world are infected by it. This parasite can cause different diseases among humans, especially pregnant women-it is linked to blindness and the death of unborn babies. However, the parasite's effects on mice are unique. Ingram and her team measured how mice reacted to a cat's urine (尿) before and after it was infected by the parasite. They noted that normal mice stayed far away from the urine while mice that were infected with the parasite walked freely around the test area. But that's not all. The parasite was found to be more powerful than originally thought-even after researchers cured the mice of the infection. They no longer reacted with fear to a cat's smell, which could indicate that the infection has caused a permanent change in mice's brains. Why does a parasite change a mouse's brain instead of making it sick like it does to humans? The answer lies in evolution. "It's exciting scary to know how a parasite can manipulate a mouse's brain this way," Ingram said. But she also finds it inspiring. "Typically if you have a bacterial infection, you go to a doctor and take antibiotics and the infection is cleared and you expect all the symptoms to also go away." She said, but this study has proven that wrong. "This may have huge implications for infectious disease medicine."
The passage is mainly about ______.
【单选题】
某分部工程有 3 个施工过程,划分为 4 个施工段组织加快的成倍节拍流水施工,流水节拍分别为 4 天,6 天和 2 天,则该分部工程需派出的专业工作队数是( )。
A.
3
B.
4
C.
5
D.
6
参考答案
参考解析
【单选题】
mice's inborn terror of cats
the evolution of Toxoplasma
a new study about the effects of a parasite on mice
a harmful parasite called Toxoplasma gondii
【单选题】
新学期,陈老师接管了一个新的班级担任班主任。开学后,陈老师立即深入了解每个学生的特点和情况,并为每个学生分别制订了学习发展规划。陈老师的做法关注了( )
学生发展的顺序性
学生发展的互补性
学生发展的普遍性
学生发展的差异性
【单选题】
患者男,48岁。突发高热,39℃,伴寒战。自述头痛、乏力、全身酸痛。查体可见眼结膜充血,双侧腓肠肌压痛,腹股沟、腋窝淋巴结肿大。当地正流行"钩端螺旋体病"。最有可能的诊断是
伤寒
肺炎
钩端螺旋体病
流行性出血热
败血症
【单选题】
张老师在一次科学实验活动后,认真反思了活动的效果,并记录了幼儿的表现,为下一次活动提供了改进建议。张老师的行为体现了教师职业道德的作用是 ( )。
动力作用
调节作用
评价作用
激励作用
【单选题】
现役军人张某由于过不惯军队生活,开小差回到城市,并且通过招工,成为一家私人酒店的保安人员,后被抓获。该酒店负责人( )。
构成阻碍军人执行职务罪.
构成雇用逃离部队军人罪.
构成煽动军人逃离部队罪.
不构成犯罪.